Is it safe to eat seaweed from my local beach?

So... there's tons of edible seaweed on the coast near where I live. However, I'm worried about pollution and so I'm slightly nervous about making it a habitual part of my diet. I live on the Bristol Channel (in the UK). Where I get the seaweed is a few miles down the coast from Avonmouth, a big docks and industrial site. The Bristol Channel is a very muddy tidal estuary.

Thanks for the link - I've already read it actually - I'm happy with the particular species of seaweed that I'm harvesting, just not sure about its proximity to a port and industrial site 10 miles away

It's toothed wrack, which is pretty distinctive. It is edible (there are recipies online). There are some poisonous species of seaweed - Desmarestia - but these are mainly in deep water, apparently, and I am sure I am not harvesting those.

Thanks for the link - I've already read it actually - I'm happy with the particular species of seaweed that I'm harvesting, just not sure about its proximity to a port and industrial site 10 miles away